The greatest secret that exists – if life was frenetic, eventually we would give up (this in fact is what burn out is – a person loses their stamina after pushing themselves too hard, too long) On the other hand, if life has no pressure, we would, like millions upon millions of people who the prosperity of western civilization and the miracle technology has enabled us, to simply do nothing! (apart from eat, have sex and play video games) – Obviously either way is no good! – Hence all of life exists in what is called the rotzu vshuv, ying and yang approach – Now we are most familiar with ratzu vshuv, an inspiration and application (for we like to be inspired but application is hard work, at least a return to details etc.) However the Baal Shem Tov teaches ratzu vshuv, also exists in the reverse; namely God gets us so demoralized by our own debauchery and meaningless state, that we seek for the meaning of life – all of life as the Alter Rebbe says exists, in the rotzu vshuv paradigm; however, as the Rebbe says, eventually, as opposed to the high and the low, and the lows which force the high, being extreme; we eventually, like the rhythmic heartbeat (which is ratzu vshuv, as well as the rhythmic, in and out of existence of atoms hence the entire universe!) achieve a rhythmic life